<div class='user_solution'><span style="text-align:justify;display:block;" class="MsoNormal"><b><u>1.Ne4</u>!</b> </span> <span style="text-align:justify;display:block;" class="MsoNormal">1.Nd5+? 1...Kd2! <i>(1...Kd4?</i> <i>2.Ne6+ Kxd5 3.Rc5+ Ke4 4.Re5#; 1...Kc2 </i>or<i>) </i>2.Rg2+ Kd1! <span> </span>3.Nd3 <i>(3.Ne3+ Kc1) </i>3...Ra6+; 1.Na4+? 1...Kb4 2.Rb7+ Ka5! 3.Rg8 Ka6</span> <span style="text-align:justify;display:block;" class="MsoNormal"> </span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>1...Kb4 2.Rb7 Ka4 3.Rg8 fxe4 4.Ra8# </b></span> <span style="text-align:justify;display:block;" class="MsoNormal"><b><i><span> </span><span>     </span><span>   </span></i>2...<span> </span>Ka5 3.Nc4 Ka6 4.Nc5# </b></span> <span style="text-align:justify;display:block;" class="MsoNormal"><b> </b></span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>1...Kd4 2.Nxf5+ Kxe4 3.Re3 Kd5</b> <b>4.Re5#</b> </span> <span style="text-align:justify;display:block;" class="MsoNormal"><b><i><span> </span><span> </span>   3...<span>    </span><span> </span><span> </span>Kf4 <span> </span>4.Rc4# </i></b></span> <span style="text-align:justify;display:block;" class="MsoNormal"> </span> <span style="text-align:justify;display:block;" class="MsoNormal"><b>or 1...Kd3 2.Nf2+ Ke2 3.Rc2+ Ke1 4.Nd3/Rg1<i># </i></b></span></div>